gas/config/tc-i386.h

   1 /* tc-i386.h -- Header file for tc-i386.c
   2    Copyright 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
   3    2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GAS, the GNU Assembler.
   7
   8    GAS is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    GAS is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GAS; see the file COPYING.  If not, write to the Free
  20    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  21    02110-1301, USA.  */
  22
  23 #ifndef TC_I386
  24 #define TC_I386 1
  25
  26 #include "opcodes/i386-opc.h"
  27
  28 struct fix;
  29
  30 #define TARGET_BYTES_BIG_ENDIAN 0
  31
  32 #define TARGET_ARCH             bfd_arch_i386
  33 #define TARGET_MACH             (i386_mach ())
  34 extern unsigned long i386_mach (void);
  35
  36 #ifdef TE_FreeBSD
  37 #define AOUT_TARGET_FORMAT      "a.out-i386-freebsd"
  38 #endif
  39 #ifdef TE_NetBSD
  40 #define AOUT_TARGET_FORMAT      "a.out-i386-netbsd"
  41 #endif
  42 #ifdef TE_386BSD
  43 #define AOUT_TARGET_FORMAT      "a.out-i386-bsd"
  44 #endif
  45 #ifdef TE_LINUX
  46 #define AOUT_TARGET_FORMAT      "a.out-i386-linux"
  47 #endif
  48 #ifdef TE_Mach
  49 #define AOUT_TARGET_FORMAT      "a.out-mach3"
  50 #endif
  51 #ifdef TE_DYNIX
  52 #define AOUT_TARGET_FORMAT      "a.out-i386-dynix"
  53 #endif
  54 #ifndef AOUT_TARGET_FORMAT
  55 #define AOUT_TARGET_FORMAT      "a.out-i386"
  56 #endif
  57
  58 #ifdef TE_FreeBSD
  59 #define ELF_TARGET_FORMAT       "elf32-i386-freebsd"
  60 #define ELF_TARGET_FORMAT64     "elf64-x86-64-freebsd"
  61 #elif defined (TE_VXWORKS)
  62 #define ELF_TARGET_FORMAT       "elf32-i386-vxworks"
  63 #endif
  64
  65 #ifndef ELF_TARGET_FORMAT
  66 #define ELF_TARGET_FORMAT       "elf32-i386"
  67 #endif
  68
  69 #ifndef ELF_TARGET_FORMAT64
  70 #define ELF_TARGET_FORMAT64     "elf64-x86-64"
  71 #endif
  72
  73 #if ((defined (OBJ_MAYBE_COFF) && defined (OBJ_MAYBE_AOUT)) \
  74      || defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF))
  75 extern const char *i386_target_format (void);
  76 #define TARGET_FORMAT i386_target_format ()
  77 #else
  78 #ifdef OBJ_ELF
  79 #define TARGET_FORMAT           ELF_TARGET_FORMAT
  80 #endif
  81 #ifdef OBJ_AOUT
  82 #define TARGET_FORMAT           AOUT_TARGET_FORMAT
  83 #endif
  84 #endif
  85
  86 #if (defined (OBJ_MAYBE_ELF) || defined (OBJ_ELF))
  87 #define md_end i386_elf_emit_arch_note
  88 extern void i386_elf_emit_arch_note (void);
  89 #endif
  90
  91 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0
  92
  93 #define LOCAL_LABELS_FB 1
  94
  95 extern const char extra_symbol_chars[];
  96 #define tc_symbol_chars extra_symbol_chars
  97
  98 extern const char *i386_comment_chars;
  99 #define tc_comment_chars i386_comment_chars
 100
 101 /* Prefixes will be emitted in the order defined below.
 102    WAIT_PREFIX must be the first prefix since FWAIT is really is an
 103    instruction, and so must come before any prefixes.
 104    The preferred prefix order is SEG_PREFIX, ADDR_PREFIX, DATA_PREFIX,
 105    LOCKREP_PREFIX.  */
 106 #define WAIT_PREFIX     0
 107 #define SEG_PREFIX      1
 108 #define ADDR_PREFIX     2
 109 #define DATA_PREFIX     3
 110 #define LOCKREP_PREFIX  4
 111 #define REX_PREFIX      5       /* must come last.  */
 112 #define MAX_PREFIXES    6       /* max prefixes per opcode */
 113
 114 /* we define the syntax here (modulo base,index,scale syntax) */
 115 #define REGISTER_PREFIX '%'
 116 #define IMMEDIATE_PREFIX '$'
 117 #define ABSOLUTE_PREFIX '*'
 118
 119 /* these are the instruction mnemonic suffixes in AT&T syntax or
 120    memory operand size in Intel syntax.  */
 121 #define WORD_MNEM_SUFFIX  'w'
 122 #define BYTE_MNEM_SUFFIX  'b'
 123 #define SHORT_MNEM_SUFFIX 's'
 124 #define LONG_MNEM_SUFFIX  'l'
 125 #define QWORD_MNEM_SUFFIX  'q'
 126 #define XMMWORD_MNEM_SUFFIX  'x'
 127 /* Intel Syntax.  Use a non-ascii letter since since it never appears
 128    in instructions.  */
 129 #define LONG_DOUBLE_MNEM_SUFFIX '\1'
 130
 131 #define END_OF_INSN '\0'
 132
 133 /*
 134   'templates' is for grouping together 'template' structures for opcodes
 135   of the same name.  This is only used for storing the insns in the grand
 136   ole hash table of insns.
 137   The templates themselves start at START and range up to (but not including)
 138   END.
 139   */
 140 typedef struct
 141 {
 142   const template *start;
 143   const template *end;
 144 }
 145 templates;
 146
 147 /* 386 operand encoding bytes:  see 386 book for details of this.  */
 148 typedef struct
 149 {
 150   unsigned int regmem;  /* codes register or memory operand */
 151   unsigned int reg;     /* codes register operand (or extended opcode) */
 152   unsigned int mode;    /* how to interpret regmem & reg */
 153 }
 154 modrm_byte;
 155
 156 /* x86-64 extension prefix.  */
 157 typedef int rex_byte;
 158
 159 /* The SSE5 instructions have a two bit instruction modifier (OC) that
 160    is stored in two separate bytes in the instruction.  Pick apart OC
 161    into the 2 separate bits for instruction.  */
 162 #define DREX_OC0(x)     (((x) & 1) != 0)
 163 #define DREX_OC1(x)     (((x) & 2) != 0)
 164
 165 #define DREX_OC0_MASK   (1 << 3)        /* set OC0 in byte 4 */
 166 #define DREX_OC1_MASK   (1 << 2)        /* set OC1 in byte 3 */
 167
 168 /* OC mappings */
 169 #define DREX_XMEM_X1_X2_X2 0    /* 4 op insn, dest = src3, src1 = reg/mem */
 170 #define DREX_X1_XMEM_X2_X2 1    /* 4 op insn, dest = src3, src2 = reg/mem */
 171 #define DREX_X1_XMEM_X2_X1 2    /* 4 op insn, dest = src1, src2 = reg/mem */
 172 #define DREX_X1_X2_XMEM_X1 3    /* 4 op insn, dest = src1, src3 = reg/mem */
 173
 174 #define DREX_XMEM_X1_X2    0    /* 3 op insn, src1 = reg/mem */
 175 #define DREX_X1_XMEM_X2    1    /* 3 op insn, src1 = reg/mem */
 176
 177 /* Information needed to create the DREX byte in SSE5 instructions.  */
 178 typedef struct
 179 {
 180   unsigned int reg;             /* register */
 181   unsigned int rex;             /* REX flags */
 182   unsigned int modrm_reg;       /* which arg goes in the modrm.reg field */
 183   unsigned int modrm_regmem;    /* which arg goes in the modrm.regmem field */
 184 } drex_byte;
 185
 186 /* 386 opcode byte to code indirect addressing.  */
 187 typedef struct
 188 {
 189   unsigned base;
 190   unsigned index;
 191   unsigned scale;
 192 }
 193 sib_byte;
 194
 195 enum processor_type
 196 {
 197   PROCESSOR_UNKNOWN,
 198   PROCESSOR_I386,
 199   PROCESSOR_I486,
 200   PROCESSOR_PENTIUM,
 201   PROCESSOR_PENTIUMPRO,
 202   PROCESSOR_PENTIUM4,
 203   PROCESSOR_NOCONA,
 204   PROCESSOR_CORE,
 205   PROCESSOR_CORE2,
 206   PROCESSOR_K6,
 207   PROCESSOR_ATHLON,
 208   PROCESSOR_K8,
 209   PROCESSOR_GENERIC32,
 210   PROCESSOR_GENERIC64,
 211   PROCESSOR_AMDFAM10
 212 };
 213
 214 /* x86 arch names, types and features */
 215 typedef struct
 216 {
 217   const char *name;             /* arch name */
 218   enum processor_type type;     /* arch type */
 219   i386_cpu_flags flags;         /* cpu feature flags */
 220 }
 221 arch_entry;
 222
 223 /* The name of the global offset table generated by the compiler. Allow
 224    this to be overridden if need be.  */
 225 #ifndef GLOBAL_OFFSET_TABLE_NAME
 226 #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
 227 #endif
 228
 229 #if (defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)) && !defined (LEX_AT)
 230 #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) x86_cons (EXP, NBYTES)
 231 extern void x86_cons (expressionS *, int);
 232 #endif
 233
 234 #define TC_CONS_FIX_NEW(FRAG,OFF,LEN,EXP) x86_cons_fix_new(FRAG, OFF, LEN, EXP)
 235 extern void x86_cons_fix_new
 236   (fragS *, unsigned int, unsigned int, expressionS *);
 237
 238 #define DIFF_EXPR_OK    /* foo-. gets turned into PC relative relocs */
 239
 240 #define NO_RELOC BFD_RELOC_NONE
 241
 242 void i386_validate_fix (struct fix *);
 243 #define TC_VALIDATE_FIX(FIX,SEGTYPE,SKIP) i386_validate_fix(FIX)
 244
 245 #define tc_fix_adjustable(X)  tc_i386_fix_adjustable(X)
 246 extern int tc_i386_fix_adjustable (struct fix *);
 247
 248 /* Values passed to md_apply_fix don't include the symbol value.  */
 249 #define MD_APPLY_SYM_VALUE(FIX) 0
 250
 251 /* ELF wants external syms kept, as does PE COFF.  */
 252 #if defined (TE_PE) && defined (STRICT_PE_FORMAT)
 253 #define EXTERN_FORCE_RELOC                              \
 254   (OUTPUT_FLAVOR == bfd_target_elf_flavour              \
 255    || OUTPUT_FLAVOR == bfd_target_coff_flavour)
 256 #else
 257 #define EXTERN_FORCE_RELOC                              \
 258   (OUTPUT_FLAVOR == bfd_target_elf_flavour)
 259 #endif
 260
 261 /* This expression evaluates to true if the relocation is for a local
 262    object for which we still want to do the relocation at runtime.
 263    False if we are willing to perform this relocation while building
 264    the .o file.  GOTOFF does not need to be checked here because it is
 265    not pcrel.  I am not sure if some of the others are ever used with
 266    pcrel, but it is easier to be safe than sorry.  */
 267
 268 #define TC_FORCE_RELOCATION_LOCAL(FIX)                  \
 269   (!(FIX)->fx_pcrel                                     \
 270    || (FIX)->fx_r_type == BFD_RELOC_386_PLT32           \
 271    || (FIX)->fx_r_type == BFD_RELOC_386_GOT32           \
 272    || (FIX)->fx_r_type == BFD_RELOC_386_GOTPC           \
 273    || TC_FORCE_RELOCATION (FIX))
 274
 275 extern int i386_parse_name (char *, expressionS *, char *);
 276 #define md_parse_name(s, e, m, c) i386_parse_name (s, e, c)
 277
 278 #define md_register_arithmetic 0
 279
 280 extern const struct relax_type md_relax_table[];
 281 #define TC_GENERIC_RELAX_TABLE md_relax_table
 282
 283 extern int optimize_align_code;
 284
 285 #define md_do_align(n, fill, len, max, around)                          \
 286 if ((n)                                                                 \
 287     && !need_pass_2                                                     \
 288     && optimize_align_code                                              \
 289     && (!(fill)                                                         \
 290         || ((char)*(fill) == (char)0x90 && (len) == 1))                 \
 291     && subseg_text_p (now_seg))                                         \
 292   {                                                                     \
 293     frag_align_code ((n), (max));                                       \
 294     goto around;                                                        \
 295   }
 296
 297 #define MAX_MEM_FOR_RS_ALIGN_CODE  31
 298
 299 extern void i386_align_code (fragS *, int);
 300
 301 #define HANDLE_ALIGN(fragP)                                             \
 302 if (fragP->fr_type == rs_align_code)                                    \
 303   i386_align_code (fragP, (fragP->fr_next->fr_address                   \
 304                            - fragP->fr_address                          \
 305                            - fragP->fr_fix));
 306
 307 void i386_print_statistics (FILE *);
 308 #define tc_print_statistics i386_print_statistics
 309
 310 #define md_number_to_chars number_to_chars_littleendian
 311
 312 #ifdef SCO_ELF
 313 #define tc_init_after_args() sco_id ()
 314 extern void sco_id (void);
 315 #endif
 316
 317 #define WORKING_DOT_WORD 1
 318
 319 /* We want .cfi_* pseudo-ops for generating unwind info.  */
 320 #define TARGET_USE_CFIPOP 1
 321
 322 extern unsigned int x86_dwarf2_return_column;
 323 #define DWARF2_DEFAULT_RETURN_COLUMN x86_dwarf2_return_column
 324
 325 extern int x86_cie_data_alignment;
 326 #define DWARF2_CIE_DATA_ALIGNMENT x86_cie_data_alignment
 327
 328 #define tc_regname_to_dw2regnum tc_x86_regname_to_dw2regnum
 329 extern int tc_x86_regname_to_dw2regnum (char *);
 330
 331 #define tc_cfi_frame_initial_instructions tc_x86_frame_initial_instructions
 332 extern void tc_x86_frame_initial_instructions (void);
 333
 334 #define md_elf_section_type(str,len) i386_elf_section_type (str, len)
 335 extern int i386_elf_section_type (const char *, size_t);
 336
 337 /* Support for SHF_X86_64_LARGE */
 338 extern int x86_64_section_word (char *, size_t);
 339 extern int x86_64_section_letter (int, char **);
 340 #define md_elf_section_letter(LETTER, PTR_MSG)  x86_64_section_letter (LETTER, PTR_MSG)
 341 #define md_elf_section_word(STR, LEN)           x86_64_section_word (STR, LEN)
 342
 343 #ifdef TE_PE
 344
 345 #define O_secrel O_md1
 346
 347 #define TC_DWARF2_EMIT_OFFSET  tc_pe_dwarf2_emit_offset
 348 void tc_pe_dwarf2_emit_offset (symbolS *, unsigned int);
 349
 350 #endif /* TE_PE */
 351
 352 #endif /* TC_I386 */